"Magneto-elastic" waves in an anisotropic magnetised plasma

TL;DR

This paper investigates magneto-elastic waves in an anisotropic magnetized plasma, identifying two wave branches and comparing fluid and kinetic models to improve understanding of plasma wave behavior.

Contribution

It introduces a detailed analysis of wave propagation in anisotropic plasmas with non-gyrotropic pressure, including a comparison between fluid and Vlasov models.

Findings

Identification of low and high frequency wave branches

Recovery of Finite Larmor Radius corrections in dispersion relations

Comparison validates fluid approach against kinetic models

Abstract

The linear waves that propagate in a two fluid magnetised plasma allowing for a non-gyrotropic perturbed ion pressure tensor are investigated. For perpendicular propagation and perturbed fluid velocity a low frequency (magnetosonic) and a high frequency (ion Bernstein) branch are identified and discussed. For both branches a comparison is made with the results of a truncated Vlasov treatment. For the low frequency branch we show that a consistent expansion procedure allows us to recover the correct expression of the Finite Larmor Radius corrections to the magnetosonic dispersion relation.